The Sacred Fount and Modernist Baroque

Cowley, Julian

doi:10.1353/hjr.1997.0027

hjr

1997

DOI: 10.1353/hjr.1997.0027

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The Sacred Fount and Modernist Baroque

Julian Cowley¹

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Cited by 4 publications

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Effect of the promoter and support on the catalytic activity of PdCeO₂‐supported catalysts for CH₄ combustion

Pecchi

Reyes

Zamora

et al. 2004

J of Chemical Tech & Biotech

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A series of palladium-ceria-supported catalysts prepared by the sol-gel method are characterized and their catalytic results are reported. It was found that the addition of ceria to alumina produces a highly dispersed catalyst when compared with their zirconia counterparts. However, the catalytic activity of the ceria zirconia series is higher, essentially due to the larger particle size of palladium. This result can be attributed to the structure-sensitive reaction of the combustion of methane.

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Effect of the promoter and support on the catalytic activity of PdCeO₂‐supported catalysts for CH₄ combustion

Pecchi

Reyes

Zamora

et al. 2004

J of Chemical Tech & Biotech

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Pd–Ce interactions and adsorption properties of palladium: CO and NO TPD studies over Pd–Ce/Al2O3 catalysts

Ciuparu

Bensalem

Pfefferle

2000

Applied Catalysis B: Environmental

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Lean NOx reduction with dodecane over cerium and palladium loaded mordenite

Córdoba

Flytzani‐Stephanopoulos

Correa

2001

Applied Catalysis B: Environmental

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The selective catalytic reduction (SCR) of NO x by dodecane in excess oxygen-containing gas mixtures was studied on Ce and/or Pd-loaded HMOR. Under dry conditions the best fresh bimetallic catalyst, 6.2 wt.% Ce-0.08 wt.% Pd-HMOR, displayed a maximum of about 70% NO x conversion to N 2 at 350 • C and GHSV = 30,000 h −1 , while either Ce-HMOR or Pd-HMOR exhibited low activity for the SCR reaction. The presence of both Ce and Pd in the zeolite was crucial for high deNO x activity. The dodecane concentration is very important for the reaction. The catalyst is not active in the absence of the reducing agent and inhibition of NO x reduction is observed at dodecane concentrations higher than 440-500 ppm. The presence of 40 ppm SO 2 in the gas feed suppresses the reaction. However, the coexistence of 15% H 2 O and 40 ppm SO 2 has no appreciable effect on the catalyst activity. Enhanced activity and a broader temperature window was observed in the NO 2 + dodecane + O 2 reaction in the presence of 15% H 2 O and 100 ppm SO 2 . In this reaction mixture, the catalyst was capable of retaining a stable NO 2 conversion to N 2 for a period of ten days. Characterization by XPS and UV-VIS-diffuse reflectance spectra (UV-VIS-DRS) of selected fresh and aged catalyst samples indicates that Pd exists mainly as Pd 2+ cations in Ce-Pd-HMOR. Cerium is mostly present as CeO 2 on the surface of the zeolite particles. However, part of the cerium in 6Ce-Pd-HMOR, exists as stable Ce 3+ species.

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The Sacred Fount and Modernist Baroque

Cited by 4 publications

References 2 publications

Effect of the promoter and support on the catalytic activity of PdCeO₂‐supported catalysts for CH₄ combustion

Effect of the promoter and support on the catalytic activity of PdCeO₂‐supported catalysts for CH₄ combustion

Pd–Ce interactions and adsorption properties of palladium: CO and NO TPD studies over Pd–Ce/Al2O3 catalysts

Lean NOx reduction with dodecane over cerium and palladium loaded mordenite

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The Sacred Fount and Modernist Baroque

Cited by 4 publications

References 2 publications

Effect of the promoter and support on the catalytic activity of PdCeO2‐supported catalysts for CH4 combustion

Effect of the promoter and support on the catalytic activity of PdCeO2‐supported catalysts for CH4 combustion

Pd–Ce interactions and adsorption properties of palladium: CO and NO TPD studies over Pd–Ce/Al2O3 catalysts

Lean NOx reduction with dodecane over cerium and palladium loaded mordenite

Contact Info

Product

Resources

About

Effect of the promoter and support on the catalytic activity of PdCeO₂‐supported catalysts for CH₄ combustion

Effect of the promoter and support on the catalytic activity of PdCeO₂‐supported catalysts for CH₄ combustion